Malicious PDF — malware analysis report

Static analysis result for SHA-256 9deafb074200385f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 14:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7aa54c72376e5e2f9c5a5922ad2e51f6 SHA-1: 8de8eb017c64027b54020b7ba32a61fd006a8c06 SHA-256: 9deafb074200385f871b7f47487ae751d0d247934b62dcd3a125a4d3fb5cf0d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of these links and the overall structure align with techniques used for SEO manipulation and distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=how+to+start+strawberry+plants+from+seeds PDF link annotation
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/js7t4ai0mmn6avbbd07ihrhqa1/27312510146.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tjr7ju79shqv3fgpr03efkcr66/44381383185.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/81423494413.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984a861cf8f---48587019205.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6dc778af3b46a1955105c36afb78cabc/wibovalaxewebu.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/zizokujewikaforiwore.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/92e0983385493451833d66215b2260aa/97246173600.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/pipuwupetuvuribudirefow.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/66694807137.pdfIn PDF document text
    • https://lazerom.pro/media/file/faxosalisuxi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7af9782a5---vezesut.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4b6d5d779325050b33dd18093512f841/26620508890.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b04vjvul44pfnu1t3h3mb6nhg2/joguw.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/68134982836.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/20605522165.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210603015151.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/gezavunesadup.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nmji5ssviu62q7t9p3cmb2k19p/wapiwena.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/shveaf69g16p5sg5g9rmql4cto/finaxug.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/viberiwe.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/2823172430.pdfIn PDF document text
    • http://techbis.pl/files/file/80619325207.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 10900 bytes
SHA-256: e6902f010619a50b3963f03181a46be41f6ad5aadab15b8f600f3d7bc2a3f04e
font_01_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 17780 bytes
SHA-256: 0d18906270ba3d292fc79d6e4ee4b3cfaa7ce2ff50c6e2babd3c576a2834ca36
font_02_sfnt_off000119e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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